ArcGIS API for Silverlight之ElementLayer使用注意点

概述<!--地图控件--> <esri:Map x:Name="myMap" ExtentChanged="myMap_ExtentChanged" WrapAround="True" IsLogoVisible="False" Extent="114.289579051054,29.3907111115968,121.380372848428,33.7272787947227">

 <!--地图控件-->        <esri:Map x:name="myMap"  ExtentChanged="myMap_ExtentChanged" WrapAround="True" IslogoVisible="False" Extent="114.289579051054,29.3907111115968,121.380372848428,33.7272787947227">            <i:Interaction.Behaviors>                <local:WheelZoom />            </i:Interaction.Behaviors>            <esri:Map.Layers>                <esri:ArcGISTiledMapServiceLayer ID="BaseLayer" Url="http://192.168.2.188/arcgis/rest/services/AnHuiBase/MapServer"/>                <!--<bing:TileLayer ID="BingLayer"></bing:TileLayer>-->                <!--Graphicslayer-->                <esri:Graphicslayer ID="MyGraphicslayer">                </esri:Graphicslayer>                <esri:Graphicslayer ID="MyGraphicslayer2">                </esri:Graphicslayer>                <esri:Graphicslayer ID="MapTipLayer">                </esri:Graphicslayer>                <!---特征图层-->                <!--<esri:FeatureLayer ID="MyFeatureLayer">                </esri:FeatureLayer>-->            </esri:Map.Layers>        </esri:Map>

ElementLayer.SetEnvelope方法很重要，必须设置

                    Graphic grahpics = sender as Graphic;                    ESRI.ArcGIS.ClIEnt.Projection.WebMercator mercator = new ESRI.ArcGIS.ClIEnt.Projection.WebMercator();                    ESRI.ArcGIS.ClIEnt.Geometry.Envelope selected = mercator.ToGeographic(grahpics.Geometry).Extent;                    ElementLayer.SetEnvelope(tip,new Envelope(new MapPoint(selected.XMin,selected.YMin),new MapPoint(selected.XMin,selected.YMin)));                    if (elementLayer.Children.Count > 0)                    {                        elementLayer.Children.Clear();                        elementLayer.Children.Add(tip);                    }                    else                    {                        elementLayer.Children.Add(tip);                    }

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